Across
- 3. the engine
- 7. power into one direction
- 9. nylon base at the envelope
- 11. rising up
- 13. top of balloon that lets air escapes
- 15. compactness
Down
- 1. material stitched together into various shapes
- 2. force of the flight
- 3. container attached to balloon that carries passengers
- 4. generated by the physics of using buoyancy
- 5. narrow portion of the envelope
- 6. to release air or gas
- 8. force pulling balloon to the ground but it has buoyancy
- 10. to fill balloon with air by
- 12. upward force that the air exerts on them
- 14. bag that contains heated air